APC has identified a firmware issue that effects the Network Management Card 1 product family in certain time zones. While using the custom daylight savings time setting and a NTP server, the time sometimes reverts back to disregard the DST settings 90 seconds after the NTP synchronization.

Resolution

APC has released AOS v3.7.3 (or higher) which addresses this particular issue for Smart UPS/Matrix (sumx), Symmetra Single & Three Phase (sy and sy3p), Rack PDU (rpdu) and Silcon (dp3e) applications when using Network Management Card 1 devices (AP9617/AP9618/AP9619). Please download the new firmware from http://www.apcc.com/tools/download or through ISX Manager and StruxureWare Central update servers. If you are unable to upgrade, use the traditional daylight savings time setting.